Bed frame



FIG. 1 is a perspective view of a bed frame showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a back elevation view thereof;

FIG. 5 is a right-hand side view thereof; and,

FIG. 6 is a left-hand side view thereof.

The broken lines are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a bed frame, as shown and described. 